I have a Samsung Intensity III. Today, it started doing this weird thing where every text I tried to send would be met with an error message basically saying the phone was unable to send the message. I had great service where I was trying to send the messages, but it acted as though I had no service. My messages where responded to, but they stilled showed up in my phone as failed messages.
That's quite a strange error. Do you happen to have the exact wording? This would help us figure out the cause of this issue. Please also try clearing out your message history, and attempt sending messages again.
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My phone hasn't done it since asking the question, but should it do it again I will make sure to send you the exact wording. Thank you for your help!